// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "cc/output/texture_mailbox_deleter.h"

#include "base/single_thread_task_runner.h"
#include "base/threading/thread_task_runner_handle.h"
#include "cc/resources/single_release_callback.h"
#include "cc/test/test_context_provider.h"
#include "cc/test/test_web_graphics_context_3d.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace cc {
namespace {

    TEST(TextureMailboxDeleterTest, Destroy)
    {
        std::unique_ptr<TextureMailboxDeleter> deleter(
            new TextureMailboxDeleter(base::ThreadTaskRunnerHandle::Get()));

        scoped_refptr<TestContextProvider> context_provider = TestContextProvider::Create();
        context_provider->BindToCurrentThread();

        GLuint texture_id = 0u;
        context_provider->ContextGL()->GenTextures(1, &texture_id);

        EXPECT_TRUE(context_provider->HasOneRef());
        EXPECT_EQ(1u, context_provider->TestContext3d()->NumTextures());

        std::unique_ptr<SingleReleaseCallback> cb = deleter->GetReleaseCallback(context_provider, texture_id);
        EXPECT_FALSE(context_provider->HasOneRef());
        EXPECT_EQ(1u, context_provider->TestContext3d()->NumTextures());

        // When the deleter is destroyed, it immediately drops its ref on the
        // ContextProvider, and deletes the texture.
        deleter = nullptr;
        EXPECT_TRUE(context_provider->HasOneRef());
        EXPECT_EQ(0u, context_provider->TestContext3d()->NumTextures());

        // Run the scoped release callback before destroying it, but it won't do
        // anything.
        cb->Run(gpu::SyncToken(), false);
    }

    TEST(TextureMailboxDeleterTest, NullTaskRunner)
    {
        std::unique_ptr<TextureMailboxDeleter> deleter(
            new TextureMailboxDeleter(nullptr));

        scoped_refptr<TestContextProvider> context_provider = TestContextProvider::Create();
        context_provider->BindToCurrentThread();

        GLuint texture_id = 0u;
        context_provider->ContextGL()->GenTextures(1, &texture_id);

        EXPECT_TRUE(context_provider->HasOneRef());
        EXPECT_EQ(1u, context_provider->TestContext3d()->NumTextures());

        std::unique_ptr<SingleReleaseCallback> cb = deleter->GetReleaseCallback(context_provider, texture_id);
        EXPECT_FALSE(context_provider->HasOneRef());
        EXPECT_EQ(1u, context_provider->TestContext3d()->NumTextures());

        cb->Run(gpu::SyncToken(), false);

        // With no task runner the callback will immediately drops its ref on the
        // ContextProvider and delete the texture.
        EXPECT_TRUE(context_provider->HasOneRef());
        EXPECT_EQ(0u, context_provider->TestContext3d()->NumTextures());
    }

} // namespace
} // namespace cc
